1211111321101 has 8 divisors (see below), whose sum is σ = 1339820975808. Its totient is φ = 1085503104000.

The previous prime is 1211111321087. The next prime is 1211111321143. The reversal of 1211111321101 is 1011231111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211111321101 - 2⁷ = 1211111320973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111321171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775358580 + ... + 775360141.

It is an arithmetic number, because the mean of its divisors is an integer number (167477621976).

Almost surely, 2^{1211111321101} is an apocalyptic number.

1211111321101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211111321101 is a deficient number, since it is larger than the sum of its proper divisors (128709654707).

1211111321101 is a wasteful number, since it uses less digits than its factorization.

1211111321101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550718803.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 1211111321101 its reverse (1011231111121), we get a palindrome (2222342432222).

The spelling of 1211111321101 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred twenty-one thousand, one hundred one".